基于中空三棱柱透镜测量液相的扩散系数  

Measuring diffusion coefficient of liquid phase based on hollow prism lens

作　　者：卢英杰 徐金辉 陈丽洁 吴科延 黄曼莉 罗国平 古迪 LU Ying-jie;XU Jin-hui;CHEN Li-jie;WU Ke-yan;HUANG Man-li;LUO Guo-ping;GU Di(School of Science,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]广东石油化工学院理学院,广东茂名525000

出　　处：《物理实验》2022年第5期48-52,56,共6页Physics Experimentation

基　　金：广东省教育厅特色创新项目(No.2018KTSCX144);2019年广东省高等教育教学改革项目(No.409);广东石油化工学院博士启动项目(No.2020bs008)。

摘　　要：介绍了利用中空三棱柱液柱透镜同时测量透明液相折射率和扩散系数的实验方法.获得三棱柱液柱透镜中液相扩散层的光束折射到光屏上形成的折射率分布曲线,计算得出液体的折射率,并求得待测液体的浓度,再根据菲克第二定律在一维无限长扩散下的解,最终计算得到2 mol/L盐水在纯水中的扩散系数D=1.50×10^(-3) mm^(2)/s,与参考值相近.Based on the hollow triangular liquid column lens,the experimental method of simultaneously measuring the refractive index and diffusion coefficient of the transparent liquid phase was introduced.The refractive index of liquid was calculated by the refractive index distribution curve formed by the refraction of the light beam of the liquid phase diffusion layer in the triangular prism liquid column lens to the light screen,and the concentration of the liquid to be measured was obtained.According to the solution of Fick’s second law under one-dimensional infinite diffusion,the diffusion coefficient D=1.50×10^(-3) mm^(2)/s NaCl solution in pure water was obtained,which was conform to the reference value.

关 键 词：中空三棱柱 液柱透镜 折射率分布 液体扩散系数 

分 类 号：O435.1[机械工程—光学工程]